MULTI-LAYER PRINTED WIRING BOARD, ITS PRODUCTION METHOD, AND METHOD FOR PRODUCING LAMINATED SHEET

摘要

PROBLEM TO BE SOLVED: To provide a multi-layer printed wiring board in which each insulating layer formed from a prepreg has an approximately constant thickness. SOLUTION: In the printed wiring board in which different kinds of circuit substrates 2 are laminated through insulating layers formed from cured prepregs 1, two or more kinds of prepregs different in the amounts of a resin of glass cloth base materials whose difference in weight per unit area is 25% or below are used. The thickness of the insulating layer can be controlled precisely so that the thickness of the insulating layers formed from the prepregs 1 of different kinds are approximately constant. By using the glass cloth base materials, the dielectric constants of the insulating layers formed from the prepregs 1 of different kinds can be made approximately equal.